Carmarthen Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Carmarthen.
Climate overview of Carmarthen
The climate in Carmarthen, Dyfed, United Kingdom, sees a moderate range of temperatures across the year, from 20°C (68°F) in July down to 9°C (48°F) in February.
The city receives considerable rainfall, with around 1306 mm (51 in) annually. December is the wettest month.
Carmarthen Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Carmarthen — and find the best time to visit.
Monthly Temperature in Carmarthen
The climate in Carmarthen experiences moderate temperature changes, with mild shifts between seasons. Typically, average maximum daytime temperatures range from a pleasant 20°C (68°F) in July to a chilly 9°C (48°F) in the coolest month, February.
Nights vary from 13°C (55°F) in July to around 4°C (39°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Carmarthen
Carmarthen experiences significant rainfall throughout the year, averaging 1306 mm (51 in) of precipitation annually. Carmarthen offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month December (139 mm (5.5 in)) and the driest month April (84 mm (3.3 in)) is not too significant. For more details, please visit our Carmarthen Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Carmarthen
Frequently asked questions about the climate in Carmarthen
What is the best time to visit Carmarthen?
July typically offers the most optimal weather in Carmarthen. In contrast, January, February, November and December tend to have less optimal conditions.
What temperatures can I expect in Carmarthen?
Daytime highs range from 9°C (48°F) in February to 20°C (68°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F).
How much rain does Carmarthen get?
Annual rainfall is around 1306 mm (51 in). December is the wettest month with 139 mm (5.5 in), while April is the driest with 84 mm (3.3 in).
Carmarthen 3-Day Forecast
Carmarthen 3-Day Forecast
Carmarthen on the map
Carmarthen is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
London
23°C (73°F) Bath22°C (72°F) York22°C (72°F) Manchester
21°C (70°F) Edinburgh
19°C (66°F) Glasgow19°C (66°F) Torquay20°C (68°F) Blackpool19°C (66°F) 
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